If the top card of your library changes while you're casting a spell, playing a land, or activating an ability, you can't look at the new top card until you finish doing so. This means that if you cast a spell from the top of your library, you can't look at the next one until you're done paying for that spell.
You can look at the top card of your library whenever you want (with one restriction; see below), even if you don't have priority. This action doesn't use the stack. Knowing what that card is becomes part of the information you have access to, just like you can look at the cards in your hand.
You must choose an existing creature type, such as Elk or Advisor. You can't choose card types (e.g., artifact) or supertypes (e.g., snow).
This printing is one of 3 catalogued treatments from PRM — the lineup includes Foil and Nonfoil alongside the standard finish. Across our catalog the Rarix library tracks every variant in the same family so collectors can compare price, scarcity and demand inside a single lineage.
Card #88334 of *Magic Online Promos*, the promotional run that shipped alongside the February 2021 Magic Online release.
Card type: Creature — Shapeshifter, color identity green, printed at rare. Rares occupy the bottom-of-pack rare slot in standard boosters. Mana cost: {2}{G} (3 converted). Keyword abilities: Changeling.
Legal across the major constructed formats — Modern, Legacy, Vintage, and Commander — plus Standard rotation play.
EDHrec ranks this card #603 in Commander, putting it in the common-include tier of the format's playable pool.
Illustrated by Zack Stella. Rarix catalogs 450 other cards credited to this artist.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Zack Stella
Card data via Scryfall. Rarix is fan-made; not endorsed by the rights holders.
Realmwalker doesn't change when you can cast creature spells. Normally, this means during your main phase when the stack is empty, although flash may change this.
If Realmwalker is somehow on the battlefield with no choice having been made for it, you may still look at the top card of your library any time. You won't be able to cast any creature spells from the top of your library, even if they have no creature types.
The top card of your library isn't in your hand, so you can't foretell it, discard it, or activate any of its activated abilities.
You'll still pay all costs for the spell, including additional costs. You may also pay alternative costs if any are available.
